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  •  The maximum number of  molecules that can be carried by haemoglobin is <p d

 The maximum number of O_{2} molecules that can be carried by haemoglobin is

 

Option: 1

2

 


Option: 2

1

 


Option: 3

6

 


Option: 4

4

 

 


Answers (1)

best_answer

@91485 

 

Oxygen Transport and Oxygen Dissociation Curve -

  • Blood is the medium of transport for O_{_{2}} and CO_{_{2}}. 
  • About 97 percent of O_{_{2}} is transported by RBCs in the blood. 
  • The remaining 3 percent of O_{_{2}} is carried in a dissolved state through the plasma. 
  • Haemoglobin is a red coloured iron-containing pigment present in the RBCs. 
  • O_{_{2}} can bind with haemoglobin in a reversible manner to form oxyhaemoglobin. This is called O2-Hb association.
  • Each haemoglobin molecule can carry a maximum of four molecules of O_{_{2}}.
  • Binding of oxygen with haemoglobin is primarily related to the partial pressure of O_{_{2}}.
  • pO_{_{2}} is high in alveoli so association occurs while at the tissues, the pO_{_{2}} decreases which cause dissociation of oxygen.
  • The partial pressure of CO_{_{2}}, hydrogen ion concentration and temperature are the other factors which can interfere with this binding. 
  • A sigmoid curve is obtained when the percentage saturation of haemoglobin with O_{_{2}} is plotted against the pO_{_{2}}. 
  • This curve is called the Oxygen dissociation curve.
  • This curve is highly useful in studying the effect of factors like pCO_{_{2}} 2, H+ concentration, etc, on the binding of O_{_{2}} 100 with haemoglobin.
  • Every 100 ml of oxygenated blood can deliver around 5 ml of O_{_{2}} to the tissues under normal physiological conditions.

 

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Each haemoglobin molecule can carry a maximum of four molecules of O_{2}. Hence, the correct option is 4

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sudhir.kumar

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